U-Tristam Model Delta III(Ｕ-トリシユトム 型デルタ ⅢU-Torishiyutomu-Gata Deruta III), known to Joey Apronika as U-ton(ユートンYūton) and to Samus Aran as Bioroid Delta III(バイオロイド デルタ ⅢBaioroido Deruta III), is a bioroid that appears in Samus and Joey. It is first seen in Volume 2, chapter 10 and is initially introduced as a friend of Joey's. Joey defends it from being destroyed by unruly men, and as gratitude, U-ton, as Joey names it, provides him with good scrap for Diesel. They become friends.